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Configuring BFD Authentication for OSPF

Configuring BFD Authentication Parameters

Only three steps are needed to configure authentication on a BFD session:

1. Specify the BFD authentication algorithm for the OSPFv2 protocol.
2. Associate the authentication keychain with the OSPFv2 protocol.
3. Configure the related security authentication keychain.

1. Specify the algorithm (keyed-md5, keyed-sha-1, meticulous-keyed-md5, meticulous-keyed-sha-1, or simple-password) to use for BFD authentication on an OSPF route or routing instance.
   [edit]user@host# set protocols ospf area 0.0.0.1 interface if2-ospf bfd-liveness-detection authentication algorithm keyed-sha-1

   Note: Nonstop active routing (NSR) is not supported with meticulous-keyed-md5 and meticulous-keyed-sha-1 authentication algorithms. BFD sessions using these algorithms might go down after a switchover.

2. Specify the keychain to be used to associate BFD sessions on the specified OSPF route or routing instance with the unique security authentication keychain attributes.

   This keychain should match the keychain name configured at the [edit security authentication key-chains] hierarchy level.

   [edit]user@host# set protocols ospf area 0.0.0.1 interface if2-ospf bfd-liveness-detection authentication keychain bfd-ospf

   Note: The algorithm and keychain must be configured on both ends of the BFD session, and they must match. Any mismatch in configuration prevents the BFD session from being created.

3. Specify the unique security authentication information for BFD sessions:
   • The matching keychain name as specified in Step 2.
   • At least one key, a unique integer between 0 and 63. Creating multiple keys enables multiple clients to use the BFD session.
   • The secret data used to allow access to the session.
   • The time at which the authentication key becomes active, in the format yyyy-mm-dd.hh:mm:ss.
   [edit security]user@host# authentication-key-chains key-chain bfd-ospf key 53 secret $9$ggaJDmPQ6/tJgF/AtREVsyPsnCtUHm start-time 2009-06-14.10:00:00
4. (Optional) Specify loose authentication checking if you are transitioning from nonauthenticated sessions to authenticated sessions.
   [edit]user@host> set protocols ospf interface if2-ospf bfd-liveness-detection authentication loose-check
5. (Optional) View your configuration using the show bfd session detail or show bfd session extensive command.
6. Repeat the steps in this procedure to configure the other end of the BFD session.

Note: BFD authentication is only supported in the Canada and United States version of the Junos OS image and is not available in the export version.

Viewing Authentication Information for BFD Sessions

You can view the existing BFD authentication configuration using the show bfd session detail and show bfd session extensive commands.

The following example shows BFD authentication configured for the if2-ospf BGP group. It specifies the keyed SHA-1 authentication algorithm and a keychain name of bfd-ospf. The authentication keychain is configured with two keys. Key 1 contains the secret data “$9$ggaJDmPQ6/tJgF/AtREVsyPsnCtUHm” and a start time of June 1, 2009, at 9:46:02 AM PST. Key 2 contains the secret data “$9$a5jiKW9l.reP38ny.TszF2/9” and a start time of June 1, 2009, at 3:29:20 PM PST.

If you commit these updates to your configuration, you see output similar to the following. In the output for the show bfd session detail command, Authenticate is displayed to indicate that BFD authentication is configured.

user@host# show bfd session detail 

                                                  Detect   Transmit
Address                  State     Interface      Time     Interval  Multiplier
10.9.1.33            Up        so-7/1/0.0          0.600     0.200      3
  Client OSPF, TX interval 0.200, RX interval 0.200, multiplier 3, Authenticate
  Session up time 3d 00:34
  Local diagnostic None, remote diagnostic None
  Remote state Up, version 1
  Replicated

1 sessions, 1 clients
Cumulative transmit rate 10.0 pps, cumulative receive rate 10.0 pps

For more information about the configuration, use the show bfd session extensive command. The output for this command provides the keychain name, the authentication algorithm and mode for each client in the session, and the overall BFD authentication configuration status, keychain name, and authentication algorithm and mode.

user@host# show bfd session extensive    
                                                  Detect   Transmit
Address                  State     Interface      Time     Interval  Multiplier
10.9.1.33            Up        so-7/1/0.0          0.600     0.200      3
  Client OSPF, TX interval 0.200, RX interval 0.200, multiplier 3, Authenticate 
       keychain bfd-ospf, algo keyed-md5, mode loose

  Session up time 3d 00:34
  Local diagnostic None, remote diagnostic None
  Remote state Up, version 1
  Replicated
  Min async interval 0.200, min slow interval 1.000
  Adaptive async tx interval 0.200, rx interval 0.200
  Local min tx interval 0.200, min rx interval 0.200, multiplier 3
  Remote min tx interval 0.100, min rx interval 0.100, multiplier 3
  Threshold transmission interval 0.000, Threshold for detection time 0.000
  Local discriminator 11, remote discriminator 80
  Echo mode disabled/inactive
 Authentication enabled/active, keychain bfd-ospf, algo keyed-sha-1, mode strict  
1 sessions, 1 clients
Cumulative transmit rate 10.0 pps, cumulative receive rate 10.0 pps